Datasheet

Typical performance L78Sxx, L78SxxC
30/39 Doc ID 2148 Rev 7
Note: Q
2
is connected as a diode in order to compensate the variation of the Q
1
V
BE
with the
temperature. C allows a slow rise time of the V
O
.
Figure 35. Adjustable output voltage with temperature compensation
V
O
= V
XX
(1+R
2
/R
1
) + V
BE
Figure 36. Light controllers (V
Omin
= V
XX
+ V
BE
)
V
O
rises when the light goes up
V
O
falls when the light goes up